package edu.hohai;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;

public class HttpRequestWS {
	/**
	     * 向指定URL发送GET方法的请求
	     * 
	     * @param url
	     *            发送请求的URL
	     * @param param
	     *            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
	     * @return URL 所代表远程资源的响应结果
	     */
	public static String sendGet(String url,String param){
		String result = "";
		BufferedReader in = null;
		try {
			String urlNameString = url + "?" + param;
			URL realUrl = new URL(urlNameString);
			//打开和URL之间的连接
			URLConnection connection = realUrl.openConnection();
			//设置通用的请求属性
			connection.setRequestProperty("accept", "*/*");
			connection.setRequestProperty("connection","Keep-Alive");
			connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
			connection.setRequestProperty("Accept-Charset","UTF-8");
			//建立实际连接
			connection.connect();
			//获取所有响应头字段
			Map<String,List<String>> map = connection.getHeaderFields();
			//遍历所有响应头字段
			for (String key :map.keySet()){
				//System.out.println(key + "---->" + map.get(key));
			}
			//定义 BufferedReader输入流来读取URL响应
			in = new BufferedReader(new InputStreamReader(connection.getInputStream(),"utf-8"));
			String line;
			while((line = in.readLine())!= null){
				result += line;
			}	
		} catch (Exception e) {
			System.out.println("发送GET请求出现异常！"+e );
			e.printStackTrace();
		}
		//使用finally块来关闭输入流
		finally{
			try {
				if (in != null){
					in.close();
				}
			} catch (Exception e2) {
				e2.printStackTrace();
			}
		}
		return result;
	}
}
